You know, I've got a problem with this quote. I think it's a little bit -too- arrogent, and relies way to much on ones own personal skills.
While he's got a general idea lost inside that statement that I do think rings true: Once you've performed enough times, for enough people, and have performed enough range of diffrent material then sure, some times you can objectivly say that X thing will work while X thing won't. But you can't (and shouldn't) wrap, sack, and sell a product based on that alone.
I think you should test run any new material before putting it out there. For christ sake look at Alpha Cards. There's a $20 dollar waste of money. Just becauses you -can- doesn't mean you -should-.
Just my two cents.
This was a minor misunderstanding:
By quoting Justin Miller is somehow to tell that sometimes you create a trick and in little time you know if is gonna be awesome or one of those tricks of So what?!! if you think is good then you work on it and perfect it, but if is bad then you pullback or re-think it or discard it. That´s what I think he was trying to say
Of course you have to test all the new material before putting it out there, I´m not saying that you should put all your new material before testing it, but before testing your new trick you have to ask yourself: is this a good trick?
sometimes is difficult to discard a trick you created because somehow is your baby, you created it and you worked on it, but if this is a bad trick, then get rid of it or improve it
I hope that clears things up, because I think we are on the same line